Source / episode info

• **Episode:**347
• **Title:**Divine Intervention Episode 347 – Cardiovascular Pharmacology for The USMLE Step 2CK/3 Exams Part 2.
• **Published:**2021-10-25
• Source:Episode page

One-liner

This episode provides a comprehensive review of advanced cardiovascular pharmacology, covering the use and contraindications of agents like Adenosine, Atropine, Digoxin, Beta-blockers, and Labetalol in managing various arrhythmias, hypertensive emergencies, and critical care syndromes.

High-yield summary

• Adenosine: The drug of choice for aborting Superventricular Tachycardia (SVT). It is absolutely contraindicated in patients with Wolff-Parkinson-White (WPW) syndrome due to risk of profound bradyarrhythmias/cardiac arrest.
• Magnesium Sulfate: First-line agent for treating eclampsia seizures and the drug of choice for managing Torsades de Pointes (TdP).
• Beta-blockers: Used for rate control in AFib and post-MI management, but are contraindicated in acute decompensated heart failure (ADHF) and should be used cautiously in patients with reactive airway disease/asthma.
• Labetalol: An / blocker that is safe in pregnancy and effective for managing hypertensive emergencies (e.g., stroke).
• Propranolol: A highly versatile agent, useful not only for rate control but also specifically indicated for thyroid storm, essential tremor, migraine prophylaxis, and stage fright due to its ability to inhibit T4 -> T3 conversion.

Learning objectives

• Differentiate the appropriate use and contraindications of Adenosine, Atropine, Digoxin, and Magnesium Sulfate in cardiac emergencies.
• Apply knowledge of \beta-blocker selectivity (\beta_1 vs. non-selective) and identify specific indications (e.g., thyroid storm, essential tremor).
• Manage hypertensive emergencies using appropriate agents, recognizing the unique drug profile for pregnancy and stroke.
• Understand the pathophysiology behind arrhythmias like Torsades de Pointes and SVT, and select targeted pharmacological interventions.
• Recognize high-yield associations between drugs and syndromes (e.g., Digoxin -> hyperkalemia; Atropine -> organophosphate poisoning).

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